Is global BCG vaccination‐induced trained immunity relevant to the progression of SARS‐CoV‐2 pandemic?

1Clinical Epidemiology and Medical Statistics Unit, Department of Medical, Surgical, Experimental Sciences, University of Sassari, Sassari, Italy 2Management Engineering Tourbillon Tech srl, Padova, Italy 3Respiratory Unit, Department of Health Sciences, ASST Santi Paolo e Carlo, Università degli Studi di Milano, Milan, Italy 4Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy 5Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy 6Allergy & Asthma Clinic, Humanitas University & Research Hospital IRCCS, Milan, Italy 7Respiratory Department, Hospital Universitario de la Princesa, Madrid, Spain 8Centro de Investigación en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III (ISCIII), Madrid, Spain 9Departments of Pneumology, Intensive Care Medicine, Center for Internal Medicine, Universitätsmedizin Rostock, Rostock, Germany

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